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    • Posted by Pragati Raj 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Kalindi Yadav 7 years, 10 months ago

    τ=1/λ =1•44 T1/2 Hence,T1/2=0•693 τ Here,τ is mean life and T1/2 is half life and λ is decay constant.

    0Thank You

    Kalindi Yadav 7 years, 10 months ago

    Mean Life/Average Life- Average life of a radioactive element can be obtained by calculating the total life time of all the atoms of the radioactive element and dividing it by the total number of atoms present initially in the sample of the element.

    0Thank You

    Aviral Tandon 7 years, 10 months ago

    abbe book me dia hai pdho na usse..yaha kya kaarre

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    ANSWER

    • Posted by Pragati Raj 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Ajeet Ravidas 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Pragati Raj 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Shivi Rajput 7 years, 10 months ago

    Bcoz a large increase in their energy increases their velocity to very large extent. This throws the electrons out of steps with oscillating field.

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    • Posted by Pragati Raj 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    .Ismat .Jamil 7 years, 10 months ago

    1.Couldn't explain origin of spectral line in form of series as in case of H atom. 2.couldn't account for scattering of alpha particles through large angles as in Rutherford experiment

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    • Posted by Pragati Raj 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    .Ismat .Jamil 7 years, 10 months ago

    Answer resistance. 20 *10^3. Tolerance 10%. According to bbroygbvgw. Black,brown,red,orange,yellow, green, blue, violet,grey,white... Represents no. 0,1,2,3,4,5,6,7,8,9.respectively. First two give numerical value,III band give power & IV band tolerance as gold(5%) ,silver (10%) & others (20%). .... red 2,black 0 ,orange 3,silver 10%

    1Thank You

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    • Posted by Pragati Raj 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Abhishek Soni 7 years, 10 months ago

    Sound wave require medium particle to propagate, But for propagation of emw no material medium required

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    • Posted by Pragati Raj 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Pragati Raj 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Kalindi Yadav 7 years, 10 months ago

    (2) Inside the pipe magnetic field is zero.(2) Outside the pipe magnetic field is B=μ0i/2πr where r is the distance from the axis.

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    • Posted by Sohaib Akhtar 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Sudarson Sengupta 7 years, 10 months ago

    Preventing it from eddy current loss

    1Thank You

    ANSWER

    • Posted by Hina Siddiqui 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Hina Siddiqui 7 years, 10 months ago

    Chances h xam mein aane ke

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    • Posted by Arpit Sarpal 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Shubham Sharma 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Kalindi Yadav 7 years, 10 months ago

    First law:In an inertial frame of reference, an object either remains at rest or continues to move at a constant velocity, unless acted upon by a force. Second law: In an inertial reference frame, the vector sum of the forces F on an object is equal to the mass m of that object multiplied by the acceleration a of the object: F = ma. (It is assumed here that the mass m is constant). Third law:When one body exerts a force on a second body, the second body simultaneously exerts a force equal in magnitude and opposite in direction on the first body.

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    • Posted by Deepak Kumar 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Drishtee Gupta 7 years, 10 months ago

    A continuous locus of all such particle of the medium which are vibrating in the same phase at any instant

    1Thank You

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    • Posted by Sakshi Singh 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Ishu Chouhan 7 years, 10 months ago

    Solve sample papers and ncert questions along with 10 years question papers

    0Thank You

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    • Posted by Alfin James 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Kalindi Yadav 7 years, 10 months ago

    The induction of an electromotive force by the motion of a conductor across a magnetic field or by a change in magnetic flux in a magnetic field.

    2Thank You

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    • Posted by Mansi Tirthani 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Jin Kazama 7 years, 10 months ago

    Ya fir dono attach hai

    1Thank You

    Jin Kazama 7 years, 10 months ago

    Dono lens ke in b/w bhi koi duri hogi vo nhi likhi kya

    0Thank You

    Jin Kazama 7 years, 10 months ago

    Lens formula ka use ker , Jo image convex bnayega vo concave ke liye virtual object ka kam karegi

    0Thank You

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    • Posted by Izaan Ai 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Jin Kazama 7 years, 10 months ago

    Must hai

    1Thank You

    ANSWER

    • Posted by Yashasvi Gautam 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Kalindi Yadav 7 years, 10 months ago

    042

    1Thank You

    ANSWER

    • Posted by Pawan Besra 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Jin Kazama 7 years, 10 months ago

    Nice work ha

    0Thank You

    Kalindi Yadav 7 years, 10 months ago

    For large TV coverage, the transmission of TV signal is done from a tall antenna. Consider a TV antenna OP of height h. The transmitting signals cannot be received beyond points R1 and R2. This is due to curvature of earth. Clearly, OR1 and OR2 are the maximum distances, from the antenna, upto which the transmission signal can be received. Let OR1 = OR2 = d [d is half the total range] The relation between height h of the TV antenna and the maximum distance d upto which the TV signal can be received can be derived on the basis of geometrical considerations. From right – angled triangle CR2P, CP2 = CR22 + PR22 …. (1) In right – angled triangle POR2, PR22 = h2 + d2 [Note that ∠POR2 can be taken as right angle] Also, CR2 = CO = R and CP = R + h From Equation (1) (R + h)2 = R2 + (h2 + d2) R2 + h2 + 2Rh = R2 + h2 + d2 or d = 2Rh−−−−√ It is clear from this equation that if h is large, d will be large. This explains as to why the television broadcasts are made from tall antennas.

    3Thank You

    Jin Kazama 7 years, 10 months ago

    2(pie)rh

    0Thank You

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    • Posted by Benedict Sabu 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Benedict Sabu 7 years, 10 months ago

    Please answer the 2nd part

    0Thank You

    Kalindi Yadav 7 years, 10 months ago

    The magnetic field B at the center of the coil of radius a is along the axis of the coil and has a magnitude : μ i / (2 a) So the current in coil Y should be equal to (i/2) in the opposite direction, so that the net magnetic field at the center is 0.

    1Thank You

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    • Posted by Jai Dhillon 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 2 answers

    Jin Kazama 7 years, 10 months ago

    To Convex

    0Thank You

    Jin Kazama 7 years, 10 months ago

    Change hoga

    0Thank You

    ANSWER

    • Posted by Sudhanshu Ranjan 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Abhay Vashishtha 7 years, 10 months ago

    If a beam of plane polarised light falls on analyser then intensity of transmitted light through analyser is directly proportional to square of cosine of angle between transmission axes of polariser and analyser

    0Thank You

    Rochie Joshi 7 years, 10 months ago

    It.

    0Thank You

    Rochie Joshi 7 years, 10 months ago

    When a polarized light from a polarizr is incident on an analyser the intensity of light varies drctly proportional to the square of cosine of angle made by ir.

    1Thank You

    ANSWER

    • Posted by Pawan Pal 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Kalindi Yadav 7 years, 10 months ago

    V= -βac RL/Ri. Negative sign shows that the output voltage is 180° out of phase with the input voltage.

    0Thank You

    ANSWER

    • Posted by Nirmal Soni 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 5 answers

    Ishu Chouhan 7 years, 10 months ago

    Vaise sab padna hoga

    0Thank You

    Ishu Chouhan 7 years, 10 months ago

    But mainly focus on this topicd

    0Thank You

    Ishu Chouhan 7 years, 10 months ago

    Cause to sab padna padega

    0Thank You

    Ishu Chouhan 7 years, 10 months ago

    Derive Mirror formula , absolute refractive index, real and apparent depth, lateral dis. And its expression, TIR, refraction through convex refracting surface in rarer medium, lens maker formula bi convex lens derivation and for convex lens(real image),prism ,angle of minimum deviation with conditions and expression , cause of dispersion, scattering of light,telescope ,optical instrument

    1Thank You

    Akash Chakraborty 7 years, 10 months ago

    Prism....lens

    2Thank You

    ANSWER

    • Posted by Ashwani Kumar Maurya 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 3 answers

    Shaurya Singh 7 years, 10 months ago

    Repeater is the combination of transmitter,receiver,and amplifier.It amplifies a signal and then retransmit it to the receiving end. It is usually done to strengthen the weak signals upto long distances.

    1Thank You

    Nirmal Soni 7 years, 10 months ago

    It is a device which picks up signal from transmitter , amplifies is or retransmit it to receiver or we can say that it is a device which is used to extend the range of communication

    3Thank You

    Rochie Joshi 7 years, 10 months ago

    Repeater is an anteena that recives the signal by transmitter and the send it to the other. Moreover it is used for long distances.

    1Thank You

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    • Posted by Vipin Kumar 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Kalindi Yadav 7 years, 10 months ago

    Linear momentum is a vector quantity defined as the product of an object’s mass, m, and its velocity, v. Linear momentum is denoted by the letter p and is called “momentum”.

    0Thank You

    ANSWER

    • Posted by Aadithya P 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Kalindi Yadav 7 years, 10 months ago

    If a body is capable of rotating about an axis, then force applied properly on this body will rotate it about the axis (axis of rotating). This turning effect of the force about the axis of rotation is called torque. Moment of inertia is the property of an object by virtue of which it opposes any change in its state of rotation about an axis.

    0Thank You

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    • Posted by Anushka Kanwar 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 0 answers
    ANSWER

    • Posted by Aagya Morris 7 years, 10 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Alia Khan 7 years, 10 months ago

    Let qo is individual charge Then F=K(( q1/(ro1)2 + q2/( ro2)2+............ n ))

    1Thank You

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